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Solve the following equation $z z + 15 = 49$ .

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z=9

z=12

z=4

z=15

answer is B.

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Detailed Solution

Given,

z z + 15 = 49

.
Using the cross-multiplication method,

⇒ z z + 15 = 49 ⇒ 9 × z = z + 15 4 ⇒ 9 z = 4 x + 60

Simplifying further,

⇒ 9 z − 4 z = 60 ⇒ 5 z = 60

⇒ z = 605 ⇒ z = 12

Hence, the value of z is 12.
Correct option is 2.

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